20130126
20130203
SHOW
STATION
DATE
LANGUAGE
TOPIC
1
1
1
1
( more )
Search Results 0 to 2 of about 3
Jan 29, 2013 8:00am PST
, just come here. let's--here we go, go on. okay. dave, get that. okay, okay. okay, don't break the chain now. anyone wearing pacemakers here? [laughter] okay. i hope not. if you're wearing a pacemaker, don't participate. okay? come on, here we go. it's okay. you back row types. those are your neighbors you're sitting next to. hold hands, it's all right. okay? [screaming] [laughter] okay, watch this, gang. inertia, huh? card, coin, huh? [applause] yeah. a body at rest tends to stay at rest. i'll show you a nice one. this one was shown to me by my friend marshall ellenstein. okay. get a little hoop like this, balance up--on top like this. [laughter] try again. marshall ellenstein. [laughter] [applause] let's take this and-- let's show, by the way, this apple. and this as well. these are sharp nails, gang, okay? i don't like this-- about an inch apart. if you don't know what an inch is, think about 2.54 centimeters, about 2.54 centimeters apart, all right? and paul is gonna... are you sure these are teflon coated? no, these are the real thing, honey. --about to go. and you know why we don't
Jan 30, 2013 4:30pm PST
, a number times itself, as we know, is said to be "squared." three rows of three pebbles, 3 x 3, equaling 9. that's not a bad example. so most numbers, even if they couldn't be shaped into squares, could at least be represented by rectangles, where by "rectangle" we mean only those that have more than one pebble in each dimension. for example, take the number 12. it can be represented by rectangles that are either two rows of six pebbles or three rows of four pebbles, so that the height and width of these boxes actually give us a visualization of a basic multiplication problem. since a rectangle has length and width, the number of its pebbles represents both the rectangle itself and the answer to a multiplication problem such as 3 x 4. but notice that certain quantities of pebbles just don't fit in a box. if you're trying to make one of these so-called "fat" rectangles out of a number like 11 or 13, something is always left over. so a number like 11 or 13 can never be the answer to a multiplication problem other than 1 x itself. this ends up being true for many numbers: 2, 3, 5, 7, 11, 13,